Describe the Bug:Mark for Death seems to be using a different method than the usual to force creature to block (also uses an optional yellow trigger not the orange one). Anyway the problem I noticed is with a creature with menace. AI cast Mark for Death targeted my Knight of Obligation to block it's Crater Hellion which had enchanted with Madcap Skills so it had menace ability.The usual assign blockers prompt came up I assigned Knight of Obligation as a blocker it was returned to battlefield through menace ability but then another prompt without cancel came that was forcing me to block and then Knight of Obligation blocked and made/received damage to attacker.

Which card did behave improperly?Mark for Death? menace? force to block?